package kr.hkit.javaproject.chapter0024;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;

public class StudentDao implements InterfaceStudent<Student> {
	private static final String FILE = "ex.data";
	private ArrayList<Student> arList;
	
	public StudentDao(){
		loadList();
	}
	
	@Override
	public void insertItem(Student item) {
		arList.add(item);
	}
	@Override
	public void deleteItem(Student item) {
		arList.remove(item);
	}
	@Override
	public void updateItem(Student item) {
		arList.set(arList.indexOf(item), item);
	}
	@Override
	public void prnItem() {
		for(Student std : arList){
			System.out.println(std);
		}
	}
	
	public void prnItem(ArrayList<Student> list) {
		for(Student std : arList){
			System.out.println(std);
		}
	}
	@Override
	public Student searchItem(Student item) {
		if (arList.contains(item)){
			return arList.get(arList.indexOf(item));
		}else{
			return null;
		}
	}
	@Override
	public void loadList() {
		ObjectInputStream ois = null;
		try {
			ois = new ObjectInputStream(new BufferedInputStream(new FileInputStream(StudentDao.FILE)));
			arList = (ArrayList<Student>) ois.readObject();
		} catch (Exception e) {
			File file = new File(StudentDao.FILE);
			try {
				file.createNewFile();
				arList = new ArrayList<>();
			} catch (Exception e1) {
				e1.printStackTrace();
			}
		} finally {
			if (ois != null) try {ois.close();}catch(Exception e){}
		}
	}
	@Override
	public void saveList() {
		ObjectOutputStream oos = null;
		try {
			oos = new ObjectOutputStream(new BufferedOutputStream(new FileOutputStream(StudentDao.FILE)));
			oos.writeObject(arList);
			oos.flush();
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (oos != null) try {oos.close();}catch(Exception e){}
		}
	}
}
